拉曼散射
光学
拉曼光谱
相干反斯托克斯拉曼光谱
材料科学
X射线拉曼散射
光谱学
散射
物理
量子力学
作者
Walker Peterson,Kazumasa Hiramatsu,Keisuke Goda
出处
期刊:Optics Letters
[The Optical Society]
日期:2019-10-28
卷期号:44 (21): 5282-5282
被引量:12
摘要
The "fingerprint" (500-1800 cm-1) and "high-frequency" (2400-4000 cm-1) regions in Raman spectroscopy are commonly used for label-free chemical analysis, while the "low-frequency" region (<200 cm-1) is often overlooked, despite containing rich information. This is largely due to the challenge of measuring weak Raman signals that are obscured by strong Rayleigh scattering. Here we propose and experimentally demonstrate Sagnac-enhanced impulsive stimulated Raman scattering (SE-ISRS), a filter-free method for time-domain Raman spectroscopy that overcomes the challenge and provides low-frequency Raman spectra at all probe frequencies. Using SE-ISRS for simultaneous low-frequency and fingerprint region measurements, we demonstrate a >5× enhancement of the signal-to-noise ratio compared to conventional ISRS spectroscopy.
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